A new poll by the Pew Research Center shows that a majority of Americans think that marijuana should be legal, and support is increasing.

(Pew Research Center)

Today, 57% of U.S. adults say the use of marijuana should be made legal, while 37% say it should be illegal. A decade ago, opinion on legalizing marijuana was nearly the reverse – just 32% favored legalization, while 60% were opposed.

The shift in public opinion on the legalization of marijuana has occurred during a time when many U.S. states are relaxing their restrictions on the drug or legalizing it altogether. In June, Ohio became the 25th state (plus Washington, D.C., Guam and Puerto Rico) to legalize marijuana in some form after Gov. John Kasich signed a medical marijuana program into law. This November, Americans in nine states will vote on measures to establish or expand legal marijuana use.